This is NOT a rumor.

MB has discontinued the 1991 190E 2.3 wire harness and several other models in the last three months.
All MB sources confirm this, and state there will be more discontinued soon.

Dealer tells me lots of inventory, no sign of any change.

DO NOT buy a 400E.....unless you want the headaches.
Best car is a 94/95 E320. You will still have wiring issues, evaporator issues (big $$$$) ball joints, need to replace the whole control arm ($$$$) transmission ($$$$) head gasket every 40KMiles + - ($$$$).
Look for a car that has had these items done and you MUST have the service history....MUST !!!!!

A 400E/E420 without ASR is about as reliable and durable car as they ever made.

Right or wrong, the 'issues' are what kept me from buying a seemingly very nice '92 400E w about 115K on it a couple of weeks ago for $4500.

It had been updated with the Euro headlights, Koni's, H&R sport springs, aftermarket wheels etc.

But being a 400E/E420 newbie, I knew I didn't yet know enough yet about 'the issues' to make a confident purchase. No maintenance history other than the last 3 years with the current owner, who put a water pump and motor mounts in.

The "issues" on that car for me would be the modifications, especiallly Koni shock absorbers. A nice 400E/E420 without ASR is probably as long lasting a used car as was ever made, but still more economically viable in the hands of a DIYer.